Doob, Leonard William, 1909-
Communication in Africa: a search for boundaries
Yale University Press, 1961
 Buku Teks
Exploring the boundaries of landscape architecture
edited by Simon Bell, Ingrid Sarlov Herlin, Richard Stiles
Routledge, 2012
 Buku Teks
Richmond, Wendy
Design & technology: erasing the boundaries
Van Nostrand Reinhold, 1990
 Buku Referensi
Prince, Thomas R.
Extension the boundaries of accounting theory
South-Western Publishing, 1963
 Buku Teks
Labour statistics : The boundaries and diversity of work
 Artikel Jurnal